论文基于光反馈原理及V型增强腔技术，结合量子串级激光器，搭建了CO吸收光谱检测系统.研究并实现了光反馈效应（反馈相位自动可调）、偶数和奇数腔模式效应、激光器阈值电流降低效应.系统有效反射率达到99.979%，在物理长度为47 cm的光腔内实现了4.48 km有效吸收路径.通过自动调节V型腔长，使光谱分辨率从0.005 3 cm^-1提高到0.001 1 cm^-1.通过阿伦方差分析，确定了最高信噪比的积分时间为53 s.气体压强40 torr，温度20 °C时，系统对CO (R(6)吸收线) 检测准确度及检测极限分别达到(97.79±0.07)%和(0.49±0.04) ppb.也分析和证明了气体压强对CO的峰值吸收强度、检测准确度及检测极限的影响.

In this paper, based on optical feedback theory and V-shaped cavity-enhanced absorption spectroscopy, combined with quantum cascade laser, a detection system for CO was built up. The optical feedback effect, even and odd modes effect, and threshold current lowering effect were studied. The effective reflectivity of 99.979% and the effective absorption path of 4.48 km in a cavity with physical length of 47 cm were obtained. By adjusting the length of V-shaped cavity automatically, the spectral resolution was improved to 0.001 1 cm^-1 from 0.005 3 cm^-1. With the best integration time of 53 s obtained by allan variance, this optical system allows detection for the R(6) band of CO with high accuracy of (97.79±0.07)% and the detection limit of (0.49±0.04) ppb at pressure of 40 torr and temperature of 20 °C. The effects of gas pressure on the absorption peak value, detection accuracy and detection limit for CO were also analyzed and demonstrated.